Uploading the PC to DMX controller code

The PC_to_controller code handles the data from the PC and transfer
them to the master DMX controller. I have tested the serial monitor on
PC to DMX code and it outputs what I inputed. But I haven't test
whether the input is successfully transfer to the DMX controller since
I only have one USB power cable. I will test this code somethime
tomorrow when I get back to the lab.
Uploading test codes and some bug fixes

Here are some test codes (SerialTest and the Conceptinetic DMX lib). I
just wrote them to see how each DMX lib differs from one to another. We
are still using softwareSerial and PC_to controller codes.